3 files changed, 9 insertions, 2 deletions
diff --git a/ChangeLog b/ChangeLog
index 4412e72e9a..ed76e7e07c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Fri Jun 30 19:37:47 2017  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* io.c (nogvl_wait_for_single_fd): nogvl_wait_for_single_fd must wait
+	  as its name.
+	  poll(fds, n, 0) mean no timeout and immediately return. If you want to
+	  wait something, you need to use -1 instead.
+
 Fri Jun 30 19:35:31 2017  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* class.c (Init_class_hierarchy): prevent rb_cObject which is the class
diff --git a/io.c b/io.c
index 72fbff3e3b..aeea680652 100644
--- a/io.c
+++ b/io.c
@@ -10136,7 +10136,7 @@ nogvl_wait_for_single_fd(int fd, short events)
     fds.fd = fd;
     fds.events = events;
 
-    return poll(&fds, 1, 0);
+    return poll(&fds, 1, -1);
 }
 
 static int
diff --git a/version.h b/version.h
index 9e525d30b4..33d2f8dab6 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.3.5"
 #define RUBY_RELEASE_DATE "2017-06-30"
-#define RUBY_PATCHLEVEL 312
+#define RUBY_PATCHLEVEL 313
 
 #define RUBY_RELEASE_YEAR 2017
 #define RUBY_RELEASE_MONTH 6